1

Hello. I must inform you from the start that I am an amateur when comes to scripting.

I am trying to create an Arcade game like the one from -->> http://unity3d.com/learn/tutorials/projects/space-shooter

Right now I am trying to create the Enemy logic, so, I managed to put together a few lines that I found on the internet and the result is the script bellow.

"

using UnityEngine;
using System.Collections;

public class EnemyAI : MonoBehaviour

{

public Transform target;
public float moveSpeed;

private Transform myTransform;

void Awake() {
	myTransform = transform;
}    

// Use this for initialization
void Start () {
	GameObject go = GameObject.FindGameObjectWithTag("Player");
	
	target = go.transform;
}        




// Update is called once per frame
void FixedUpdate () 
{
	Debug.DrawLine(target.position, myTransform.position, Color.yellow);

	
	
	//Move on target's X position
	Vector3 playerPosition = new Vector3 (target.position.x, 0.0f, 0.0f);
	GetComponent<Rigidbody> ().velocity = playerPosition * moveSpeed; // PROBLEM
	myTransform.position = playerPosition * moveSpeed; // PROBLEM
}

}

"

I have managed to get the enemy to seek for the Player’s position on X axis. Now, my question is how do I get him moving in a slow motion maner so the Player should have the time to avoid intersecting him on the X axis.

I have tried two different things which I commented them with //PROBLEM in the script:

  1. GetComponent ().velocity = playerPosition * moveSpeed;

This line lets me to create some sort of a Slow Motion movement for the Enemy object. The thing is, using this code, the Enemy doesn’t inherit the Players position. It doesn’t stop to Player’s X position. I have increased the Angular Drag value from the RigidBody component just to see if I can achieve a similar result to what I want but it doesn’t. It moves the Enemy object with a certain speed until the Player stops from moving around.

  1. myTransform.position = playerPosition * moveSpeed;

I tried this as well. Using this line, the Enemy object inherited the Player’s X position. The thing is, it follows the EXACT position which I don’t want to. I want to give the Player the chance to avoid this object. That is why I tried to include the “moveSpeed” value which it did not work. Instead of decreasing the speed of the Enemy object, it multiplied the playerPosition with the value that I gave to “moveSpeed”.

For example:

if moveSpeed = 1 => Enemy X position = Player X Position;

if moveSpeed = 0.5 => Enemy X position = Player X Positon / 2;

if moveSpeed = 2 => Enemy X position = Player X Position * 2;

This is not the result that I want.

I want the Enemy to inherit the Player’s X Position but at the same time to slow down the movement of the Enemy object so the Player can avoid it.

Can someone help me with this?

PS: I will include a Y movement too but this movement will be constant so I don’t belive it will be too troublesome. I already created that for other objects in the game using the tutorial that I mentioned from the start.

3

Cosmin, if I understand you correctly, you want the enemy to move towards the player’s position in X, but at some limited speed. In that case, you want code like this:

Vector3 pos = transform.position;
pos.x = Mathf.MoveTowards(pos.x, target.position.x, Time.deltaTime * speed);
transform.position = pos;

If you want to do something with Y, just insert that between the second and third lines above.

And whenever anybody recommends you use Lerp, be suspicious – in most cases you want MoveTowards instead. :slight_smile:

2

Hi
you can user this script

public class NewBehaviourScript : MonoBehaviour {
	public Transform target;
	public float moveSpeed;
	public float realtime;
	
	private Transform myTransform;
	
	void Awake() {
		myTransform = transform;
	}    
	
	// Use this for initialization
	void Start () {
		GameObject go = GameObject.FindGameObjectWithTag("Player");
		target = go.transform;
	}        
	
	
	
	
	// Update is called once per frame
	void FixedUpdate () 
	{
		//Move on target's X position
		Vector3 playerPosition = new Vector3 (target.position.x, 0.0f, 0.0f);
		GetComponent<Rigidbody> ().velocity = playerPosition * moveSpeed; 
		myTransform.transform.Translate (Mathf.Clamp(moveSpeed*Time.deltaTime,0,realtime*Time.deltaTime),0f,0f);

	}

	void OnDrawGizmos(){

		Gizmos.color = Color.red;
		Gizmos.DrawLine(target.position,this.transform.position);

	}

}